Heat the oven to 300 degrees Fahrenheit.
In a big bowl, mix sugar, eggs, cornstarch, flour, and salt until well blended.
Add melted butter, then gently mix in pecans, pineapple, and coconut.

 

Put the pie crust in a round baking dish and pour the pecan mixture over it. Press the edges of the crust together.

Put the baking dish in the oven and bake for 55 minutes, or until it is almost cooked.
Put aluminum foil on top and bake for 15-20 minutes more, or until the middle is firm.
Take out of the oven and decorate with whipped cream and toasted coconut. Have fun!